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<H2><A NAME="SECTION001610000000000000000">
6.1 Using the Postfix mail server</A>
</H2>
<P>
Mailman should work pretty much out of the box with a standard Postfix
installation. It has been tested with various Postfix versions up to and
including Postfix 2.1.5.
<P>
By default, Postfix treats <code>-owner</code> and <code>-request</code> addresses
specially. Since you want Postfix to deliver such messages to Mailman, you
should turn off this option by adding this to your <span class="file">main.cf</span> file:
<P>
<div class="verbatim"><pre>
owner_request_special = no
</pre></div>
<P>
In order to support Mailman's optional VERP delivery, you will want to disable
<code>luser_relay</code> (the default) and you will want to set
<code>recipient_delimiter</code> for extended address semantics. You should comment
out any <code>luser_relay</code> value in your <span class="file">main.cf</span> and just go with the
defaults. Also, add this to your <span class="file">main.cf</span> file:
<P>
<div class="verbatim"><pre>
recipient_delimiter = +
</pre></div>
<P>
Using "<tt class="samp">+</tt>" as the delimiter works well with the default values for
<var>VERP_FORMAT</var> and <var>VERP_REGEXP</var> in <span class="file">Defaults.py</span>.
<P>
When attempting to deliver a message to a non-existent local address, Postfix
may return a 450 error code. Since this is a transient error code, Mailman
will continue to attempt to deliver the message for
<var>DELIVERY_RETRY_PERIOD</var> - 5 days by default. You might want to set
Postfix up so that it returns permanent error codes for non-existent local
users by adding the following to your <span class="file">main.cf</span> file:
<P>
<div class="verbatim"><pre>
unknown_local_recipient_reject_code = 550
</pre></div>
<P>
Finally, if you are using Postfix-style virtual domains, read the section on
virtual domain support below.
<P>
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></a>
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<LI><A href="node13.html">6.1.1 Integrating Postfix and Mailman</a>
<LI><A href="postfix-virtual.html">6.1.2 Virtual domains</a>
<LI><A href="node15.html">6.1.3 An alternative approach</a>
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<span class="release-info">Release 2.1, documentation updated on December 22, 2004.</span>
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